DE102015217673A1 - Injection device for metering a fluid and motor vehicle with such an injection device - Google Patents
Injection device for metering a fluid and motor vehicle with such an injection device Download PDFInfo
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- DE102015217673A1 DE102015217673A1 DE102015217673.8A DE102015217673A DE102015217673A1 DE 102015217673 A1 DE102015217673 A1 DE 102015217673A1 DE 102015217673 A DE102015217673 A DE 102015217673A DE 102015217673 A1 DE102015217673 A1 DE 102015217673A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/167—Means for compensating clearance or thermal expansion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0251—Details of actuators therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
- F02M21/026—Lift valves, i.e. stem operated valves
- F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
- F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Einspritzvorrichtung (1) zur Zumessung eines Fluids, die folgendes aufweist: – ein Ventil (3) mit einer Ventilnadel (5) und einem Ventilsitz (9); – einen die Ventilnadel (5) umgebenden Düsenschaft (15), der ein Volumen des Fluids aufnimmt; – eine sich auf der dem Ventil (3) abgewandten Seite des Düsenschafts (15) an diesen anschließende und mit diesem in Fließverbindung stehende Einlasskammer (19); wobei die Einspritzvorrichtung (1) zumindest ein mit einem Gas gefülltes, komprimierbares Volumenausgleichselement (33) aufweist, das innerhalb der Einspritzvorrichtung (1) in Kontakt mit dem Fluid steht.Injection device (1) for metering a fluid, comprising: - a valve (3) with a valve needle (5) and a valve seat (9); - A valve needle (5) surrounding the nozzle shaft (15) which receives a volume of the fluid; - An on the valve (3) facing away from the nozzle shaft (15) to this subsequent and in fluid communication with this inlet chamber (19); wherein the injector (1) comprises at least one gas-filled, compressible volume compensator (33) in contact with the fluid within the injector (1).
Description
Die vorliegende Offenbarung bezieht sich auf eine Einspritzvorrichtung zur Zumessung eines Fluids. Insbesondere bezieht sie sich auf eine Einspritzvorrichtung zur Zumessung einer Harnstofflösung in einem Abgasnachbehandlungssystem eines Kraftfahrzeuges. Sie bezieht sich weiter auf ein Kraftfahrzeug mit einer derartigen Einspritzvorrichtung. The present disclosure relates to an injection device for metering a fluid. In particular, it relates to an injection device for metering a urea solution in an exhaust aftertreatment system of a motor vehicle. It further relates to a motor vehicle with such an injection device.
Eine Einspritzvorrichtung zur Zumessung eines flüssigen oder gasförmigen Mediums, insbesondere einer Harnstofflösung, ist beispielsweise aus der
Bisher wurde beispielsweise durch ein Leerspritzen der Einspritzvorrichtung beim Abstellen des Motors versucht, die Harnstofflösung weitgehend aus der Einspritzvorrichtung zu entfernen, um eine Schädigung der Einspritzvorrichtung durch eine Volumenausdehnung beim Einfrieren zu verhindern. Ein vollständiges Leerspritzen der Einspritzvorrichtung ist jedoch nicht in allen Fällen möglich und auch grundsätzlich nicht unbedingt erwünscht. Heretofore, for example, an empty injection of the injection device when stopping the engine has attempted to largely remove the urea solution from the injection device in order to prevent damage to the injection device by a volume expansion during freezing. However, a complete empty syringes of the injection device is not possible in all cases and in principle not necessarily desirable.
Es ist eine Aufgabe der vorliegenden Erfindung, eine Einspritzvorrichtung zur Zumessung eines Fluids anzugeben, bei der die Gefahr einer Zerstörung durch einfrierendes Fluid vermindert ist. It is an object of the present invention to provide an injection device for metering a fluid in which the risk of destruction by freezing fluid is reduced.
Diese Aufgabe wird gelöst durch den Gegenstand des Patentanspruchs 1. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche. This object is achieved by the subject matter of claim 1. Advantageous embodiments are the subject of the dependent claims.
Gemäß einem ersten Aspekt der Erfindung wird eine Einspritzvorrichtung zur Zumessung eines Fluids angegeben. Gemäß einem weiteren Aspekt wird ein Kraftfahrzeug mit der beschriebenen Einspritzvorrichtung angegeben. According to a first aspect of the invention, an injection device for metering a fluid is specified. According to a further aspect, a motor vehicle is specified with the described injection device.
Die Einspritzvorrichtung weist ein Ventil mit einer Ventilnadel und einem Ventilsitz sowie einen die Ventilnadel umgebenden Düsenschaft auf, der ein Volumen des Fluids aufnimmt. Ferner weist die Einspritzvorrichtung eine sich auf der dem Ventil abgewandten Seite des Düsenschafts an diesen anschließende und mit diesem in Fließverbindung stehende Einlasskammer auf. Die Einspritzvorrichtung weist zumindest ein mit einem Gas gefülltes, komprimierbares Volumenausgleichselement auf, das innerhalb der Einspritzvorrichtung in Kontakt mit dem Fluid steht. Der Ventilschaft ist vorzugsweise von einem Ventilkörper der Einspritzvorrichtung und/oder von dem zumindest einen Volumenausgleichselement gebildet. Die Einspritzvorrichtung ist bei einer Ausgestaltung ein Fluid-Einspritzventil. The injection device has a valve with a valve needle and a valve seat and a nozzle shaft surrounding the valve needle, which receives a volume of the fluid. Further, the injection device has a side facing away from the valve on the nozzle shaft to this subsequent and in fluid communication with this inlet chamber. The injector includes at least one gas-filled, compressible volume balance element that is in contact with the fluid within the injector. The valve stem is preferably formed by a valve body of the injection device and / or by the at least one volume compensation element. In one embodiment, the injection device is a fluid injection valve.
Dabei wird hier und im Folgenden unter einem mit dem Fluid in Kontakt stehenden Volumenausgleichselement ein Volumenausgleichselement verstanden, auf das durch das Fluid Kräfte ausgeübt werden können. Insbesondere ist das Volumenausgleichselement derart ausgebildet und angeordnet, dass im Falle eines Einfrierens des Fluids aufgrund der Volumenzunahme Kräfte auf das Volumenausgleichselement ausgeübt werden. Da das Volumenausgleichselement komprimierbar ist, kann es eine Volumenausdehnung des Fluids kompensieren. Die Kompensation erfolgt insbesondere durch eine Komprimierung des Gases, mit dem das Volumenausgleichselement gefüllt ist. Insbesondere ist das Volumenausgleichselement derart ausgelegt, dass sich sein Volumen beim Erstarren einer den Ventilschaft füllenden Harnstofflösung um einen Wert verringert, der 3,5 % oder mehr, vorzugsweise um 5 % oder mehr, insbesondere zwischen einschließlich 5 % und einschließlich 9 % des Volumens des Ventilschafts entspricht. Unter dem Volumen des Ventilschafts wird dabei dasjenige Fluid-Volumen verstanden, das der Ventilschaft im Betrieb der Einspritzvorrichtung zur Einspritzung des Fluids aufnimmt. Here and in the following, a volume compensation element which is in contact with the fluid is understood to mean a volume compensation element to which forces can be exerted by the fluid. In particular, the volume compensation element is designed and arranged such that in the case of freezing of the fluid due to the increase in volume forces are exerted on the volume compensation element. Since the volume compensation element is compressible, it can compensate for volume expansion of the fluid. The compensation is effected in particular by a compression of the gas with which the volume compensation element is filled. In particular, the volume compensation element is designed such that its volume during the solidification of a urea solution filling the valve stem is reduced by a value of 3.5% or more, preferably 5% or more, in particular between 5% and 9% inclusive of volume Valve stem corresponds. In this case, the volume of the valve stem is understood as the fluid volume which the valve stem receives during the operation of the injection device for the injection of the fluid.
Auf diese Weise ist die Gefahr einer Beschädigung der Einspritzvorrichtung besonders gering. Insbesondere ist das Volumenausgleichselement auf diese Weise dazu ausgebildet, die Volumenzunahme von Harnstofflösung beim Erstarren auszugleichen. Diese beträgt beispielsweise ca. 7 %. In this way, the risk of damaging the injection device is particularly low. In particular, the volume compensation element is designed in this way to compensate for the volume increase of urea solution during solidification. This is for example about 7%.
Gemäß einer Ausführungsform weist das zumindest eine Volumenausgleichselement einen Wandbereich aus einem martensitausgehärteten Stahl auf. Der Wandbereich kann dabei die Gasfüllung ganz oder teilweise umschließen. Die Verwendung eines martensitausgehärteten Stahls für das Volumenausgleichselement hat den Vorteil, dass bei diesem Material der Übergang zwischen einem elastischen und einem plastischen Verhalten bei sehr hohen Kräften liegt, so dass das Material eine hohe Festigkeit bei einer gleichzeitig hohen Zähigkeit aufweist. According to one embodiment, the at least one volume compensation element has a wall area made of a martensite-hardened steel. The wall area can completely or partially enclose the gas filling. The use of a martensitic hardened steel for the volume compensation element has the advantage that in this material, the transition between an elastic and a plastic behavior is at very high forces, so that the material has a high strength with a simultaneously high toughness.
Martensitausgehärtete Stähle werden auch als „Maraging-Stähle“ (von englisch „martensite“ und „aging“ für „martensitaushärtbar“) bezeichnet. Sie weisen üblicherweise einen sehr geringen Kohlenstoffanteil auf und sind mit einem hohen Anteil Nickel legiert und können weitere Legierungselemente wie Kobalt, Molybdän, Aluminium, Kupfer, Niob und/oder Titan aufweisen, die die Ausbildung der Martensitphase im Eisen bei einer geeigneten Wärmebehandlung unterstützen. Herkömmliche Maraging-Stähle haben zwar einen verhältnismäßig hohen Nickelanteil von typischerweise mehr als 8 Gew.%, teilweise mehr als 12 Gew.%. Daneben gibt es jedoch neuere Hochleistungsstähle, die ebenfalls zu den Maraging-Stählen zählen, mit einem Nickelgehalt von nur 2–3 Gew.% und einem Mangangehalt von 9–12 Gew.%. Auch derartige Maraging-Stähle sind für den Wandbereich des Volumenausgleichselementes geeignet. Martensitized steels are also referred to as "maraging steels"("martensitehardenable" in English) and "aging". They usually have a very low carbon content and are alloyed with a high proportion of nickel and may contain other alloying elements such as cobalt, molybdenum, aluminum, copper, niobium and / or titanium which aid in the formation of the martensite phase in the iron with a suitable heat treatment. Although conventional maraging steels have a relatively high nickel content of typically more than 8% by weight, in some cases more than 12% by weight. There are also however, newer high-performance steels, which also belong to the maraging steels, with a nickel content of only 2-3% by weight and a manganese content of 9-12% by weight. Such maraging steels are also suitable for the wall area of the volume compensation element.
Bei dieser Ausbildung des Volumenausgleichselementes kann es insbesondere vorgesehen sein, dass ein Band oder Blech aus martensitausgehärtetem Stahl an eine Innenwand des Düsenschafts oder der Einlasskammer derart angeschweißt ist, dass zwischen der Innenwand und dem Blech oder Band aus martensitausgehärtetem Stahl eine mit Gas gefüllte Tasche ausgebildet ist, die das Volumenausgleichselement darstellt. Bei einer solchen Bauform wirkt sich ausdehnendes Fluid beim Einfrieren auf den Wandbereich aus martensitausgehärtetem Stahl, welcher seinerseits auf das dahinter eingeschlossene Gas wirkt. Die gasgefüllte Tasche wird somit komprimiert. In this embodiment of the volume compensation element, it can be provided, in particular, that a strip or sheet of martensitic hardened steel is welded to an inner wall of the nozzle shaft or the inlet chamber such that a pocket filled with gas is formed between the inner wall and the sheet or strip of martensitic hardened steel , which represents the volume compensation element. In such a design expands fluid when freezing on the wall area of martensitaus cured steel, which in turn acts on the trapped behind the gas. The gas-filled bag is thus compressed.
Diese Ausführungsform hat den Vorteil, dass sich das Volumenausgleichselement gezielt dort anordnen lässt, wo typischerweise die Gefahr einer Beschädigung der Einspritzvorrichtung durch stehendes Fluid besonders groß ist. This embodiment has the advantage that the volume compensation element can be arranged specifically where typically the risk of damaging the injection device due to stagnant fluid is particularly great.
Gemäß einer weiteren Ausführungsform weist das zumindest eine Volumenausgleichselement Bereiche aus einem elastischen, porösen Kunststoff auf, wobei die Poren des Kunststoffs mit einem Gas gefüllt sind. Bei dieser Ausführungsform wird ebenfalls ein flexibel einsetzbares Volumenausgleichselement zur Verfügung gestellt, das gezielt dort angeordnet werden kann, wo Schäden aufgrund sich ausdehnenden Fluids zu erwarten wären. Zudem hat die Verwendung eines elastischen, porösen Kunststoffs den Vorteil, dass das Volumenausgleichselement verhältnismäßig leicht ist und nicht so einfach undicht werden kann, wodurch eine Komprimierbarkeit verloren ginge. According to a further embodiment, the at least one volume compensation element has regions made of an elastic, porous plastic, wherein the pores of the plastic are filled with a gas. In this embodiment, a flexibly usable volume compensation element is also provided, which can be selectively arranged where damage due to expanding fluid would be expected. In addition, the use of a resilient, porous plastic has the advantage that the volume compensation element is relatively easy and can not be easily leaked, whereby a compressibility would be lost.
In einer Ausführungsform ist das zumindest eine Volumenausgleichselement als Inlay ausgebildet und im Inneren der Einspritzvorrichtung derart angeordnet, dass es im Wesentlichen vollständig von dem Fluid umgeben ist. In one embodiment, the at least one volume compensation element is formed as an inlay and arranged in the interior of the injection device such that it is substantially completely surrounded by the fluid.
Dabei wird hier und im Folgenden unter einem Inlay ein separates Element verstanden, das bereits für sich das Volumenausgleichselement darstellt und in einer Kammer der Einspritzvorrichtung angeordnet wird. Das Inlay ist dann im Wesentlichen vollständig von dem Fluid umgeben, wenn es im weit überwiegenden Bereich seiner Oberfläche von Fluid umgeben ist. Kleine Oberflächenbereiche – beispielsweise von 25 % oder weniger, vorzugsweise von 10 % oder weniger, insbesondere von 5 % oder weniger – können beispielsweise für eine Aufhängung oder Befestigung des Inlays in der Kammer genutzt werden, so dass diese nicht mit dem Fluid in Berührung kommen. Here and below an inlay is understood to mean a separate element which already represents the volume compensation element per se and is arranged in a chamber of the injection device. The inlay is then substantially completely surrounded by the fluid when it is surrounded by fluid in the vast majority of its surface. Small surface areas - for example, 25% or less, preferably 10% or less, more preferably 5% or less - may be used, for example, to suspend or secure the inlay in the chamber so that it does not come in contact with the fluid.
Diese Ausführungsform hat den Vorteil, dass eine große Oberfläche des Volumenausgleichselementes für die Einwirkung von durch das Fluid ausgeübten Kräften zur Verfügung steht. This embodiment has the advantage that a large surface of the volume compensation element is available for the action of forces exerted by the fluid.
In einer alternativen Ausführungsform ist das zumindest eine Volumenausgleichselement als Verkleidung einer Wand des Düsenschafts und/oder der Einlasskammer ausgebildet. Dabei kann das Volumenausgleichselement beispielsweise als Wandverkleidung aus elastischem, porösen Kunststoff ausgebildet sein oder als gasgefüllte Tasche mit einem Wandbereich aus martensitausgehärtetem Stahl. In an alternative embodiment, the at least one volume compensation element is designed as a lining of a wall of the nozzle shaft and / or the inlet chamber. In this case, the volume compensation element may be formed, for example, as a wall cladding made of elastic, porous plastic or as a gas-filled bag with a wall area of martensitausgehärtem steel.
Diese Ausführungsform hat den Vorteil, dass die Befestigung des Volumenausgleichselementes innerhalb der Einspritzvorrichtung verhältnismäßig einfach ist. This embodiment has the advantage that the attachment of the volume compensation element within the injection device is relatively simple.
Das Volumenausgleichselement kann insbesondere in einer Einlasskammer (englisch „Inlet tube“) der Einspritzvorrichtung angeordnet sein. Alternativ oder zusätzlich kann sie auch im Düsenschaft der Einspritzvorrichtung angeordnet sein. The volume compensation element can in particular be arranged in an inlet chamber ("inlet tube") of the injection device. Alternatively or additionally, it can also be arranged in the nozzle shaft of the injection device.
In diesen Bereichen steht einerseits der Bauraum zur Verfügung, andererseits sind dies auch die Bereiche, in denen das Fluid steht und im Falle eines Einfrierens Schäden zu erwarten sind. In these areas, on the one hand, the space available, on the other hand, these are also the areas in which the fluid is in the event of freezing and damage can be expected.
Gemäß einer Ausführungsform ist die Ventilnadel aus martensitausgehärtetem Stahl ausgebildet und weist in ihrem Inneren einen mit Gas gefüllten Hohlraum auf. Bei dieser Ausführungsform stellt die Ventilnadel selbst das Volumenausgleichselement oder eines der Volumenausgleichselemente dar. Durch ihre verformbaren Wände und den mit Gas gefüllten Hohlraum ist sie komprimierbar. According to one embodiment, the valve needle is formed from martensit-hardened steel and has a gas-filled cavity in its interior. In this embodiment, the valve needle itself constitutes the volume compensation element or one of the volume compensation elements. It is compressible through its deformable walls and the gas-filled cavity.
Diese Ausführungsform hat den Vorteil, dass ein verhältnismäßig großes Volumenausgleichselement zur Verfügung gestellt werden kann, ohne dass zusätzlicher Bauraum innerhalb der Einspritzvorrichtung geschaffen werden muss. This embodiment has the advantage that a relatively large volume compensation element can be provided without additional space has to be created within the injector.
Die Einspritzvorrichtung ist insbesondere als Einspritzvorrichtung für eine Harnstofflösung in einer Abgasnachbehandlung ausgebildet, da aufgrund des Gefrierpunktes von Harnstofflösung von –7°C derartige Einspritzvorrichtungen entsprechend gegen eine Zerstörung durch die Volumenausdehnung des Harnstoffs geschützt werden müssen. The injection device is designed in particular as an injection device for a urea solution in an exhaust aftertreatment, since due to the freezing point of urea solution of -7 ° C such injectors must be protected accordingly against destruction by the volume expansion of urea.
Gemäß einem weiteren Aspekt der Erfindung ist es auch möglich, Teile der Einspritzvorrichtungaus martensitausgehärtetem Stahl auszubilden, um eine besondere Widerstandsfähigkeit zu erreichen. Beispielsweise kann eine Düsenplatte, welche insbesondere den Ventilsitz und/oder mindestens eine Düse der Einspritzvorrichtung aufweist, aus martensitausgehärtetem Stahl ausgebildet sein. Alternativ oder zusätzlich kann der Ventilkörper – insbesondere zumindest im Bereich des Düsenschafts – aus martensitausgehärtetem Stahl ausgebildet sein. Der Düsenschaft ist bei dieser und anderen Ausgestaltungen vorzugsweise stromaufwärts von der Düsenplatte angeordnet und kann insbesondere an diese angrenzen. Düsenschaft und Düsenplatte können einstückig – d.h. insbesondere aus ein und demselben Werkstück hergestellt – oder separat gefertigt sein. Dies kann mit den beschriebenen Volumenausgleichselementen kombiniert werden oder in Alleinstellung angewandt werden, um eine bessere Festigkeit der Einspritzvorrichtung zu erhalten. According to another aspect of the invention, it is also possible to form parts of the martensitic hardened steel injector to form a to achieve special resistance. For example, a nozzle plate, which in particular has the valve seat and / or at least one nozzle of the injection device, may be formed from martensite-hardened steel. Alternatively or additionally, the valve body may be formed of martensite hardened steel, in particular at least in the region of the nozzle shaft. In this and other embodiments, the nozzle shaft is preferably arranged upstream of the nozzle plate and can adjoin it in particular. Nozzle shaft and nozzle plate can be made in one piece - ie in particular made from one and the same workpiece - or manufactured separately. This can be combined with the described volume compensation elements or used alone to obtain a better strength of the injector.
Weitere Vorteile sowie vorteilhafte Ausgestaltungen und Weiterbildungen der Einspritzvorrichtung ergeben sich aus den folgenden, anhand von Figuren näher beschriebenen Ausführungsbeispielen. Further advantages and advantageous embodiments and further developments of the injection device will become apparent from the following, described in more detail with reference to figures embodiments.
Die Einspritzvorrichtung
Auf der dem Ventil abgewandten Seite des Düsenschafts
Im Betrieb sind die Einlasskammer
Die elektromagnetische Betätigungsvorrichtung hat eine Spule
Die Einspritzvorrichtung
Die Volumenausgleichselemente
Die Volumenausgleichselemente
Im Falle eines Einfrierens der Harnstofflösung und einer damit verbundenen Volumenzunahme übt die Harnstofflösung eine Kraft auf die Wand
In der gezeigten Ausführungsform weist der martensitausgehärtete Stahl eine Zusammensetzung auf von 8 Gew.% Nickel, 1 Gew.% Molybdän, 13 Gew.% Chrom, maximal 0,5 Gew.% Beryllium, Rest Eisen. Dieses Material weist eine sehr gute Verformbarkeit gute Federeigenschaften sowie eine gute Korrosionsbeständigkeit auf. Wie sich herausgestellt hat, ist es aufgrund dieser Eigenschaften zur Ausbildung von Volumenausgleichselementen
Da die Ventilnadel
Das Inlay
Im Falle eines Einfrierens der Harnstofflösung wirken von allen Seiten Kräfte auf das Inlay
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 2008041544 A1 [0002] DE 2008041544 A1 [0002]
Claims (10)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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DE102015217673.8A DE102015217673A1 (en) | 2015-09-15 | 2015-09-15 | Injection device for metering a fluid and motor vehicle with such an injection device |
CN201680053595.4A CN108026813B (en) | 2015-09-15 | 2016-08-10 | Injection device for metering a fluid and motor vehicle having such an injection device |
KR1020187007417A KR102035436B1 (en) | 2015-09-15 | 2016-08-10 | Injection device for metering fluids and automobiles with such injection device |
EP16753629.1A EP3350428B8 (en) | 2015-09-15 | 2016-08-10 | Injection device for metering a fluid and motor vehicle having such an injection device |
PCT/EP2016/069022 WO2017045845A1 (en) | 2015-09-15 | 2016-08-10 | Injection device for metering a fluid and motor vehicle having such an injection device |
US15/922,548 US10975821B2 (en) | 2015-09-15 | 2018-03-15 | Injection device for metering a fluid and motor vehicle having such an injection device |
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DE102015217673.8A DE102015217673A1 (en) | 2015-09-15 | 2015-09-15 | Injection device for metering a fluid and motor vehicle with such an injection device |
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DE102015217673A1 true DE102015217673A1 (en) | 2017-03-16 |
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DE102015217673.8A Ceased DE102015217673A1 (en) | 2015-09-15 | 2015-09-15 | Injection device for metering a fluid and motor vehicle with such an injection device |
Country Status (6)
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US (1) | US10975821B2 (en) |
EP (1) | EP3350428B8 (en) |
KR (1) | KR102035436B1 (en) |
CN (1) | CN108026813B (en) |
DE (1) | DE102015217673A1 (en) |
WO (1) | WO2017045845A1 (en) |
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2015
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2016
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- 2016-08-10 CN CN201680053595.4A patent/CN108026813B/en active Active
- 2016-08-10 KR KR1020187007417A patent/KR102035436B1/en active IP Right Grant
- 2016-08-10 EP EP16753629.1A patent/EP3350428B8/en active Active
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2018
- 2018-03-15 US US15/922,548 patent/US10975821B2/en active Active
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US10975821B2 (en) | 2015-09-15 | 2021-04-13 | Vitesco Technologies GmbH | Injection device for metering a fluid and motor vehicle having such an injection device |
EP3521581A1 (en) * | 2018-02-01 | 2019-08-07 | Continental Powertrain USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
EP3521580A1 (en) * | 2018-02-01 | 2019-08-07 | Continental Powertrain USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
US10947880B2 (en) | 2018-02-01 | 2021-03-16 | Continental Powertrain USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
US11041421B2 (en) | 2018-02-01 | 2021-06-22 | Continental Powertrain USA, LLC | Injector for reductant delivery unit having fluid volume reduction assembly |
WO2019158278A1 (en) * | 2018-02-16 | 2019-08-22 | ECO Holding 1 GmbH | Valve for injecting water into an internal combustion engine, dosing valve and internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
KR20180041178A (en) | 2018-04-23 |
CN108026813B (en) | 2020-03-20 |
US10975821B2 (en) | 2021-04-13 |
EP3350428B8 (en) | 2021-12-15 |
WO2017045845A1 (en) | 2017-03-23 |
KR102035436B1 (en) | 2019-10-22 |
CN108026813A (en) | 2018-05-11 |
EP3350428A1 (en) | 2018-07-25 |
US20180202404A1 (en) | 2018-07-19 |
EP3350428B1 (en) | 2021-11-10 |
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